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The Single UNIX &reg; Specification, Version 2<br>
Copyright &copy; 1997 The Open Group

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<h4><a name = "tag_000_008_396">&nbsp;</a>NAME</h4><blockquote>
setgid - set-group-ID
</blockquote><h4><a name = "tag_000_008_397">&nbsp;</a>SYNOPSIS</h4><blockquote>
<pre><code>

#include &lt;<a href="systypes.h.html">sys/types.h</a>&gt;
#include &lt;<a href="unistd.h.html">unistd.h</a>&gt;

int setgid(gid_t <i>gid</i>);
</code>
</pre>
</blockquote><h4><a name = "tag_000_008_398">&nbsp;</a>DESCRIPTION</h4><blockquote>
If the process has appropriate privileges,
<i>setgid()</i>
sets the real group ID, effective group ID
&nbsp;and the saved set-group-ID
&nbsp;to
<i>gid</i>.
<p>
If the process does not have appropriate privileges, but
<i>gid</i>
is equal to the real group ID
&nbsp;or the saved set-group-ID,
<i>&nbsp;setgid</i>()
function sets the effective group ID to
<i>gid</i>;
the real group ID
&nbsp;and saved set-group-ID
&nbsp;remain unchanged.
<p>
Any supplementary group IDs of the calling process remain
unchanged.
</blockquote><h4><a name = "tag_000_008_399">&nbsp;</a>RETURN VALUE</h4><blockquote>
Upon successful completion, 0 is returned.  Otherwise, -1 is returned and
<i>errno</i>
is set to indicate the error.
</blockquote><h4><a name = "tag_000_008_400">&nbsp;</a>ERRORS</h4><blockquote>
The
<i>setgid()</i>
function will fail if:
<dl compact>

<dt>[EINVAL]<dd>
The value of the
<i>gid</i>
argument is invalid and is not supported by the implementation.

<dt>[EPERM]<dd>
The process
does not have appropriate privileges and
<i>gid</i>
does not match the real group ID
&nbsp;or the saved set-group-ID.

</dl>
</blockquote><h4><a name = "tag_000_008_401">&nbsp;</a>EXAMPLES</h4><blockquote>
None.
</blockquote><h4><a name = "tag_000_008_402">&nbsp;</a>APPLICATION USAGE</h4><blockquote>
None.
</blockquote><h4><a name = "tag_000_008_403">&nbsp;</a>FUTURE DIRECTIONS</h4><blockquote>
None.
</blockquote><h4><a name = "tag_000_008_404">&nbsp;</a>SEE ALSO</h4><blockquote>
<i><a href="exec.html">exec</a></i>,
<i><a href="getgid.html">getgid()</a></i>,
<i><a href="setuid.html">setuid()</a></i>,
<i><a href="systypes.h.html">&lt;sys/types.h&gt;</a></i>,
<i><a href="unistd.h.html">&lt;unistd.h&gt;</a></i>.
</blockquote><h4>DERIVATION</h4><blockquote>
Derived from Issue 1 of the SVID.
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UNIX &reg; is a registered Trademark of The Open Group.<br>
Copyright &copy; 1997 The Open Group
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